{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-64532",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-64532"
  ],
  "published": "2026-07-27T06:32:40Z",
  "summary": "fs/ntfs3: bound NTFS_DE view.data_off in UpdateRecordData{Root,Allocation}",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/ntfs3: bound NTFS_DE view.data_off in UpdateRecordData{Root,Allocation}\n\nIn do_action()'s UpdateRecordDataRoot (fslog.c:3489) and\nUpdateRecordDataAllocation (fslog.c:3697) cases, the memmove\ndestination is `Add2Ptr(e, le16_to_cpu(e->view.data_off))`,\nwhere e->view.data_off comes from an on-disk NTFS_DE inside\nan INDEX_ROOT or INDEX_BUFFER.  Neither case validates\nview.data_off + dlen against e->size; the existing\ncheck_if_index_root / check_if_alloc_index helpers walk the\nentry chain and validate the entry's offset, but not its\ninternal view fields.\n\nThe neighbouring read sites (e.g., fs/ntfs3/index.c when\niterating view entries) check view.data_off + view.data_size\n<= e->size.  Apply the same bound at the two memmove sites.\n\nReproduced under UML+KASAN on mainline 8d90b09e6741 via\npr_warn-only probe instrumentation: with view.data_off forced\nto 0xFFFC, the memmove writes 32 bytes past the end of the\nNTFS_DE.\n\nThis is similar in shape to Pavitra Jha's 2026-05-02 patch\n\"fs/ntfs3: prevent oob in case UpdateRecordDataRoot\"\n(<20260502105008.21827-1-jhapavitra98@gmail.com>) which\nproposes calling ntfs3_bad_de_range(); that helper does not\nexist in mainline.  This patch uses inline checks.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
    }
  ],
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            "upstream_fixed": "6.18.40"
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            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.40"
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        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-64532"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b20e5a709d8bd190d6e4645606763c7423e694c1"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d41b382068ca4e64e421f736cdd700095464b6ac"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/429d653ca641d38a78609b8f62e81a0a5c780a2d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/315d3a9a48b49f889da3d858a9307e677cb9e1bd"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/be306b8d9143a9c076c804a7ca025d69caf9c448"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/36feda687afebae24c472202694448738809c411"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3e127829e57f5190f612412ece4541cb96d5ec7a"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:24:08Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The vulnerable journal-replay handlers are reached by mounting a crafted NTFS image or block device, not through a network receive path.\nAC:L - The attacker controls the index entry offset, copy length, and copied redo or undo data, making the out-of-bounds write deterministic without a race or external condition.\nPR:N - Although directly mounting NTFS3 requires initial-namespace CAP_SYS_ADMIN, an attacker needs no target-system privileges to supply a malicious image or volume that a privileged victim mounts.\nUI:R - In the no-privilege attack scenario, a victim must mount the crafted filesystem read-write so journal replay executes the vulnerable operation.\nS:U - The corruption occurs within the host kernel and impacts resources governed by that same security authority; it is not inherently a VM, IOMMU, or hypervisor escape.\nC:H - The attacker-controlled heap out-of-bounds write can corrupt adjacent kernel objects and plausibly enable code execution or arbitrary kernel-memory disclosure.\nI:H - The attacker chooses the copied bytes and a forward offset of up to 65535 bytes, permitting corruption of adjacent kernel objects or persistent filesystem metadata and potential control-flow hijacking.\nA:H - The out-of-bounds memmove can produce a kernel oops or panic during mount, as supported by the KASAN reproduction, causing complete system unavailability."
    }
  }
}